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Hybrid graphene-manganite thin film structure for magnetoresistive sensor application

机译：用于磁阻传感器应用的杂化石墨烯 - 锰岩薄膜结构

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摘要

An increasing demand of magnetic field sensors with high sensitivity at room temperatures and spatial resolution at micro-nanoscales has resulted in numerous investigations of physical phenomena in advanced materials, and fabrication of novel magnetoresistive devices. In this study the novel magnetic field sensor based on combination of a single layer graphene (SLG) and thin nanostructured manganite La0.8Sr0.2MnO3 (LSMO) film-hybrid graphene-manganite (GM) structure, is proposed and fabricated. The hybrid GM structure employs the properties of two materials-SLG and LSMO-on the nanoscale level and results in the enhanced sensitivity to magnetic field of the hybrid sensor on the macroscopic level. Such result is achieved by designing the hybrid GM sensor in a Wheatstone half-bridge which enables to employ in the device operation two effects of nanomaterials-large Lorentz force induced positive magnetoresistance of graphene and colossal negative magnetoresistance of nanostructured manganite film, and significantly increase the sensitivity S of the hybrid GM sensor in comparison with the individual SLG and LSMO sensors: S = 5.5 mV T-1 for SLG, 14.5 mV T-1 for LSMO and 20 mV T-1 for hybrid GM at 0.5 T, when supply voltage was 1.249 V. The hybrid GM sensor operates in the range of (0.1-2.3) T and has lower sensitivity to temperature variations in comparison to the manganite sensor. Moreover, it can be applied for position sensing. The ability to control sensor's characteristics by changing technological conditions of the fabrication of hybrid structure and tuning the nanostructure properties of manganite film is discussed.
机译：在室温下具有高灵敏度和微纳米阶段的空间分辨率的磁场传感器的越来越大导致了高级材料的物理现象以及新颖的磁阻装置的制造。在该研究中，提出并制造了基于单层石墨烯（SLG）和薄纳米结构锰LA0.8SR0.2MNO3（LSMO）薄膜 - 杂交石墨烯 - 锰（GM）结构的组合的新型磁场传感器。 Hybrid GM结构采用两种材料 - SLG和LSMO-on纳米级水平的性质，并导致宏观传感器上的混合传感器磁场的增强灵敏度。通过在惠麦石半桥中设计混合动力通用传感器传感器来实现这些结果，这使得能够在装置操作中采用纳米材料大型洛伦兹力诱导的石墨烯和甲醛负磁阻的正磁阻，并且显着增加混合动力通用传感器的敏感性与单独的SLG和LSMO传感器相比：S = 5.5 mV T-1用于SLG，14.5 mV T-1，用于LSMO和20mV T-1，用于0.5 T时为0.5 T，电源电压Hybrid GM传感器的范围为1.249 V.与锰铁传感器相比，对温度变化的敏感性较低。此外，它可以应用于位置感测。讨论了通过改变杂化结构制备的技术条件和调节锰矿膜的纳米结构性能来控制传感器特性的能力。

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